"Unexpected error" crash, clueless as to what to do

[Rhaervis]

Good afternoon and thank you for posting on the Final Fantasy XIV Technical Support Forums.

We would like to recommend several other troubleshooting steps:

1) Make sure that your hardware is not overheating and remove any overclocks you may have on your graphics card or processor. Please check that any fans or vents are clear of blocks.
2) Disable any additional programs that could cause interference with the game itself including chat programs. Also, remove any custom configurations made using graphics driver-level programs
3) Remove any mods or injectors from the game or system
4) Turn off Fullscreen Optimizations. Find the executable file for the game (normally found in the install folder), right-click it and select 'Properties'. Under the 'Compatibility' tab, check the box labeled 'Disable Fullscreen Optimizations', then click 'Apply'.
5) Remove any unnecessary USB or audio devices (controllers, headphones, flash drives etc.)

Thank you for visiting the Final Fantasy XIV Technical Support Forums.

[Firespark]

I've tried all of the above steps by now, but it still crashes out completely randomly. I've even tried to do a reinstall of it and reset my user data (like saved interface stuff), but nothing seems to provide a proper fix. At seemingly random, it would still crash out with the same error message. Sometimes it takes about an hour, sometimes it's within ten minutes of me logging in.

I have no clue what the problem is, as there was no new program installed recently on my PC, everything is as it used to be a month prior, when I had no issues. The only changes made were OS updates and driver updates.